Configuration Tips for the PC Server 325
Configuration Tips for the PC Server 325
- You cannot use the CD-ROM drive to terminate the internal SCSI bus. Termination for the CD-ROM
drive is controlled by the SCSI device attached to the last connector on the internal SCSI cable.
If you are not installing an internal hard disk drive on the same SCSI bus as the CD-ROM drive and
you do not have a model 1RY or 2RY, you must terminate the internal SCSI bus by attaching an
active terminator, IBM Part Number 94G7587, to the last connector on the internal SCSI cable.
(Models 1RY and 2RY come with a self-terminating cable.)
- If you want the ServeRAID II or ServeRAID-3H adapter to control the CD-ROM drive:
- Leave the CD-ROM drive attached to the internal SCSI cable.
- Disconnect the internal SCSI cable from the system board.
- Attach the internal SCSI cable to an internal channel on the ServeRAID adapter.
- If you are not using a model 1RY or 2RY, attach a terminated hard disk drive to the last connector on the internal cable.
- When you install multiple hard-disk controllers, RAID controllers, or ServeRAID adapters in the same
server, you must install the device that will manage the startup (boot) drives in a PCI slot that is
scanned before subsequent hard-disk controllers or RAID adapters.
In the PC Server 325, the PCI slots are scanned in the following order: 3, 2, 1, 6, 5, 4.
- Each ServeRAID adapter supports up to eight logical drives. If a failure occurs, the remaining
ServeRAID adapter will need to support its own logical drives and the logical drives of its counterpart
in the failing server.
Therefore, the total number of shared logical drives for each set of ServeRAID adapters must not exceed eight.
A good way to ensure that you do not exceed this limit would be to define no more than four logical drives for each ServeRAID adapter.
- With the ServeRAID adapters and controllers, you can set the stripe-unit size to 8 K (the default), 16 K, 32 K, or 64 K.
After you set a stripe-unit size and store data on the logical drives, you cannot change the size without destroying data in the logical drives. In a clustered environment, both
ServeRAID adapters in a pair must be of the same type and must use the same stripe-unit size.
- When the stripe-unit size is set to 8 K or 16 K, the maximum number of physical hard disk drives in an array is 16.
- When the stripe-unit size is set to 32 K or 64 K, the maximum number of physical hard disk drives in an array is eight.
- You must use IBM 100/10 PCI EtherJet Adapters for the cluster's heartbeat connection.
- You can use the integrated Ethernet controllers that come standard on some server models to connect
the server to the public network, however, these integrated controllers are not certified for use as the
cluster's heartbeat connection.
- You must use a point-to-point, Category 5 crossover cable for the heartbeat connection. Connections
through a hub are not supported.
- When using the Vinca High Availability for NetWare program, refer to the NetWare documentation for
information about calculating the amount of system memory needed to support the number and
capacity of hard disk drives you intend to install.
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